Cracking the SAT Chemistry Subject Test

Reduction   Is  Gaining Electrons

AN  OX

Oxidation   Occurs  at  Anode

RED CAT

Reduction   Occurs  at  Cathode

•           Galvanic    Cell:   E°cell  >   0   means   reaction    is  spontaneous and energy  is

released    (battery).

•           Electrolytic    Cell:   E°cell  <   0   means   the reaction    is  NOT spontaneous and

requires    a   voltage source  (electro    plating).

Equilibrium

•           Keq =   

Reactants       Products    for 

aA+bB       cC+dD

Keq =   

Keq >:  Products    favored

Keq <:  Reactants   favored